Circular saw clamp



Nov. 10, 1936. J. 5. HUGHES cmcumn SAW CLAMP Filed May 15, 1935 lNVE-NTOFZ JOSEPH 5. HUGHES ALII'TORNEY l Patented Nov. 10, 1936 UNITED STATES PATENT OFFICE CIRCULAR SAW CLAMP Joseph S. Hughes, Los Angelcs, Calif. Application May 15, 1933, Serial No. 671,122

7 Claims.

This invention has to do in a general way with a holding or clamping device, and is more particularly related to devices which are especially designed for use in holding or clamping circular 5- saws and the like during a filing or sharpening operation.

It is a primary object of this invention to produce a device of the class described which is of simple form and construction, and which is com- 10 pact and light in weight so that it may be easily carried in a carpenters kit. My invention is, therefore, especially adapted for use in sharpening relatively small circular saws of the so-called portable type.

5 It is a further object of this invention to produce a device of the class described which is equipped with means for vertically adjusting the position of the saw so that it will readily accommodate saws of various diameters. In this 20 connection, my invention contemplates a novel form of adjusting means which include as a unit a member that serves the dual purpose of holding the pin or bolt, that supports the saw, against rotation and also holds the saw in various posi- 25 tions of vertical adjustment. e

The details in the construction of a preferred form of my invention, together with other objects attending its production, will be best understood from the following description of the accompany- 30 ing drawing which is chosen for illustrative purposes only, and in which- Fig. l is a sectional elevation showing a preferred form of my invention;

Fig. 2 is a sectional View partly broken away 35 and which may be considered as having been taken in a plane represented by the line 2-2 in Fig.

Fig. 3 is a plan section along the line 3-3 in Fig. 1; and 40 Fig. 4 is a plan section along the line 44 in Fig. 1.

More particularly describing the invention as herein illustrated, reference numeral ll indicates, what I may term, a face plate which is provided with suitable supporting means shown as comprising a pair of spaced flanges or jaws I2 and i3 having reinforcing ribs l2 and I3, the lower member I3 being provided with a threaded screw M clamp M of any conventional type whereby the unit can be clamped to a table or shelf indicated by reference numeral l5.

The face plate I I is provided with an elongated opening IB which is positioned between the clamping plates l2 and 13.

Reference numeral ll indicates, what I may term, a saw-supporting bolt which has a T head generally indicated by reference numeral H], such head being adapted to slidably retain the bolt against axial movement within the elongated opening l6. Inthis form of my invention, the 5 T head [9 is formed of a width such that it can be inserted through the opening l6 and then turned through 90 so that the head projects laterally on each side of the opening to retain the bolt against axial movement. 10

For the purpose of preventing the bolt turning into a position at which the head portion I9 is in alignment with the slot or opening I6, I provide the inner end portion of the bolt with an elongated pin 20 which may be in the nature of a screw, such pin or screw having an enlarged head 2| which is slidably received in a groove 22 formed in the face plate below the opening IS. The engagement of the head 2| in the groove 22 will obviously prevent the rotation of the bolt at all times.

7 Reference numeral 23 indicates a saw of the circular type having a central opening 24 through which the bolt ll extends. It will be observed that the saw at one point engages the head 2| on 25 the pin 20 and it is thereby held in spaced relation with the face plate, a flange 26 being provided at the upper edge of the face plate so that the saw is properly. supported on both sides of its axis. In this connection, it will be observed that 30 when the saw is pressed into clamping engagement with the head 2| and the flange 26, the head 2|, by virtue of its engagement with the groove 22, will be eifective to lock the bolt ll in any predetermined position of vertical adjustment. This provides a simple and economical construction which permits the clamp to be readily dismantled and which permits quick adjustment for various sizes of saws.

The saw is clamped into engagement with the head 2| and the flange 26 through the medium of a nut 30 which is in threaded engagement with the outer end of the bolt and which engages, at its inner end, a washer member 3|.

It is desirable in a device of this character that the saw tightening means be arranged so that the saw can freely turn without turning the tightening nut, and for this reason I provide means to hold the washer against rotation and at the same time permit its longitudinal movement, such means comprising a projection or key member 32 in the washer which extends into a longitudinal key way or groove 33 on the bolt.

In this form of my invention, the bolt 30 is rotatably mounted on the washer so that the washer and the bolt constitute what is in effect a tightening unit for the saw. This connection may be executed in various ways. In the device as shown, sections are cut from the washer and bent over a flange 36 on the inner end of the nut.

It is to be understood that, while I have herein described and illustrated one preferred embodiment of my invention, the invention is not limited to the precise construction described above, but includes within its scope whatever changes fairly come within the spirit of the appended claims.

I claim as my invention:

1. A device for holding a circle saw or the like embodying: a face plate having an elongated opening therein; means for supporting said face plate; a bolt slidably mounted in said elongated opening for supporting a saw or the like, a nut in threaded engagement with the outer end of said bolt; a washer on said nut for engaging said saw, and a pin mounted in said bolt adjacent said face plate, said pin having a head slidably engaging a groove in said face plate and adapted to be engaged by the face of a circle saw supported by said bolt.

2. A device for holding a circle saw or the like embodying: a face plate having an elongated opening therein; means for supporting said face plate; a bolt slidably mounted in said elongated opening for supporting a saw or the like; a nut in threaded engagement with the outer end of said bolt; a washer on said nut for engaging said saw; a flange at the upper edge of said face plate for holding said saw in spaced relation with said face plate, and a pin mounted in said bolt adjacent said face plate, said pin having a head slidably engaging a groove in said face plate and adapted to be engaged by the face of a circle saw supported by said bolt.

3. A device for holding a circle saw or the like, embodying: a face plate having an elongated opening therein; means for supporting said face plate; a bolt slidably mounted in said elongated opening for supporting a saw or the like; a nut in threaded engagement with the outer end of said bolt; a washer on said nut for engaging said saw; and means for holding said saw in spaced relation with said face plate, said last mentioned means including a pin member mounted on said bolt extending in a groove in the face plate and having a portion thereof interposed between said face plate and said saw, said pin member preventing rotation of said bolt.

4. A device for holding a circle saw or the like embodying: a face plate having an elongated opening therein; supporting means for said face plate; a saw supporting bolt having a T-head on its inner end slidably received in said opening; a washer slidably mounted on said bolt for engaging a saw or the like supported thereby; a nut rotatably mounted on said washer in threaded engagement with said bolt; and a pin mounted in said bolt adjacent said face plate, said pin having a head slidably received in a groove in said face plate.

5. A device for holding a circle saw or the like embodying: a face plate having an elongated opening therein; supporting means for said face; a saw supporting bolt having a T-head on its inner end slidably received in said opening; a washer slidably mounted on said bolt for engaging a saw or the like supported thereby; a nut rotatably mounted on said washer in threaded engagement with said bolt; a pin mounted in said bolt adjacent said face plate, said pin having a head slidably received in a groove in said face plate and engaging said saw; and a flan e on the side of said face plate opposite the head on said pin for engaging said saw.

6. A device for holding a circle saw or the like, embodying; a face plate having an elongated opening therein; means for supporting said face plate; a bolt slidably mounted in said elongated opening for supporting a saw or the like; a washer slidably mounted on said bolt for engaging said saw; a nut rotatably mounted on said washer in threaded engagement with said bolt; and means comprising a pin member supported by said bolt cooperating with means on the face plate preventing circular movement of said pin whereby rotation of said bolt is prevented and having an enlarged portion thereon frictionally engaged by said saw and said face plate when said nut is tightened against said saw for looking said bolt in various positions of vertical adjustment in said elongated opening.

7. A device for holding a circle saw or the like, embodying: a face plate having an elongated opening therein; means for supporting said face plate; a bolt slidably mounted in said elongated opening for supporting a saw or the like; a nut threaded to said bolt for applying pressure to said saw; pin means supported by said bolt at substantially right angles thereto, whereby a portion of said pin is adapted to be frictionally engaged between said saw and within a groove in said face plate when said nut is in pressure engagement with said saw for locking said bolt in various positions of vertical adjustment in said elongated opening.

JOSEPH S. HUGHES. 

